Altronix AL400ULPD4 Multi-Output Power Supply/Charger

The Altronix AL400ULPD4 is a four-output supervised power supply and battery charger designed for commercial access control, security, fire protective signaling, and nurse call equipment. Converting 115VAC input into selectable 12VDC at 4A or 24VDC at 3A, it provides four individually fuse-protected, Class 2 power-limited outputs rated at 3.5A each, subject to the power supply's total capacity. The unit features automatic battery backup switchover, AC failure and battery supervision, short-circuit protection, and regulated DC output. Its indoor wall-mounted steel enclosure accommodates two 12V 7Ah batteries, sold separately.

Altronix AL400ULPD4 12/24VDC 4-Output Supervised Power Supply and Charger

The Altronix AL400ULPD4 Multi-Output Power Supply/Charger is a supervised low-voltage power distribution system engineered to supply regulated DC power to commercial security, access control, fire protective signaling, and nurse call equipment. Part of the Altronix AL400ULX Series, the AL400ULPD4 converts a 115VAC, 60Hz primary power source into selectable 12VDC or 24VDC output. Its integrated PD4UL distribution module provides four individually fuse-protected Class 2 power-limited outputs, allowing compatible low-voltage devices to be powered from a centralized enclosure. The power supply is suitable for electronic door locking systems, intrusion alarm accessories, security controllers, emergency signaling equipment, and other applications requiring a UL-listed supervised DC power source.

The AL400ULPD4 delivers a maximum combined continuous output of 4A at 12VDC or 3A at 24VDC, with each of its four fuse-protected distribution circuits rated at 3.5A. The individual circuit ratings do not increase the overall available output current, which must remain within the selected voltage's total power supply capacity. Filtered and electronically regulated outputs provide stable power for compatible security equipment, while integrated short-circuit, thermal overload, and overvoltage protection help protect the power supply and connected electrical circuits. The unit incorporates a 115VAC input section and dedicated low-voltage distribution terminals for field wiring. Output voltage is selected according to the manufacturer's configuration instructions, allowing one power supply platform to accommodate either 12VDC or 24VDC system designs.

Designed for supervised standby power and continuous security system operation, the Altronix AL400ULPD4 incorporates a built-in charger for compatible sealed lead-acid or gel-type standby batteries. During normal operation, the power supply maintains the connected batteries while powering the external load. If AC input fails, the system automatically transfers to battery power with no voltage drop associated with the battery switchover, helping maintain operation of connected equipment. The charger provides a maximum charging current of 0.7A and supports an appropriate battery configuration based on the selected output voltage. Integrated supervision includes Form C contacts for AC failure, low battery, and battery presence monitoring. The AC failure reporting delay can be selected for approximately 30 seconds or 6 hours, allowing installers to configure the supervisory response according to the connected monitoring equipment and installation requirements.

The AL400ULPD4 provides centralized power distribution for electronic security and signaling applications, with four individually protected circuits that can feed compatible equipment operating at the selected output voltage. Typical applications include access control readers and controllers, electric locking hardware with suitable electrical requirements, intrusion detection accessories, and supported nurse call or fire protective signaling equipment. The PD4UL fused distribution board provides circuit-level protection, while the main power supply incorporates LED indicators for AC input and DC output status. Supervision contacts can be connected to compatible alarm or monitoring inputs to report electrical supply problems and battery conditions. The AL400ULPD4 is a power supply and distribution assembly rather than an access control relay controller or standalone fire alarm control panel; door release logic, fire alarm interface functions, and notification sequencing must be provided by compatible external equipment where required.

The Altronix AL400ULPD4 is housed in a wall-mounted steel BC300 enclosure designed for indoor installation. The current manufacturer's AL400ULX Series datasheet specifies enclosure dimensions of approximately 13 inches high, 12.5 inches wide, and 3.25 inches deep, with a product weight of approximately 7.1 pounds. The enclosure includes combination 1/2-inch and 3/4-inch conduit knockouts and provides space for two 12V 7Ah sealed lead-acid batteries, purchased separately. The power supply operates in ambient temperatures from 32 F to 120 F (0 C to 49 C) and is designed for dry indoor electrical installations. Manufacturer-documented listings include UL 294 for access control system units, UL 603 for burglar alarm power supplies, UL 1069 for hospital signaling and nurse call equipment, and UL 1481 for fire protective signaling power supplies. Altronix also identifies the model as NDAA, TAA, and BAA compliant and backs the product with its limited lifetime manufacturer warranty. The AL400ULPD4 provides supervised, battery-backed, multi-circuit DC power distribution for professionally installed security and signaling systems.